WIRING HARNESS *
Same harness as CAT # 138-2405
Information from PACCAR manual:
"* 138-2405 has blue and black wires to attach to accumulator isolator solenoid on valve 174-0333. These two wires are not used on earlier valve 138-2403 without the accumulator isolator solenoid.
** If replacing early control valve 138-2403 that does not have the accumulator isolator solenoid, you must order new harness 138-2405 that has the additional blue and black wires for the new valve, 174-0333.